Roasting-furnace shaft.



E. l. FOWLEB.

- RDASTIHG FURNACE SHAFT.

APrucmol msn :uw a. ma.

1-;278,129. Pamasepm, 1918.

UNITED srATEs PATENT oEEicE.

EDWARD J. FOWLEB, OF REDWOOD cirv, CALIFORNIA, AssIeNon To GENERALCHEMICAL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

noAsTINe-FUENACE SHAFT. v

Specication of Letters Patent. v Patented Sept. 10, 1918.

Application iled July 3, 1915. Serial No. 37,810.

To all whom t may concern.' p

Be it known that I, EDWARD J. FowL'ER, a citizen of the United States,and a resident of Redwood City, county of San Mateo, and State ofCalifornia, have invented certain new and useful Improvements inRoasting- Furnace Shafts, of which the following, taken in connectionwith the accompanying drawings, is a specification.

My invention relates to furnaces, espe cially such as are used forroasting ores, and such as are provided with superposed sta- -tionaryhearths upon which the ore is stirred and distributed by rakes or plowsaiiixed to rotating arms, said arms being in turn'affixed toandrotatable with a central vertical shaft which extends through centralapertures in the hearths and is rotated byv any suitable mechanism.

More particularly my invention relates to the central, rotatable shaftsof such furnaces, of the type in which longitudinal passages areprovided for conducting a cooling medium to and from the rabble armsthrough a plurality of longitudinally spaced and angularly disposed setsof rabble arm inlet and outlet ports or apertures, and an object of myinvention is to produce a shaft in which the passages are provided bypartitioning the outer shell of the shaft longitudinally, thepartitioning means extending between and separating the inlet and outletports of each of said sets. Another object of my invention is to producea hollow shaft having rabble arm outlet and inlet ports andv meansextending between andseparating the said ports, said partitioning meansdividing the shaft into unequal cross-sectional portions. Other obhavingpartitioning jects of my invention will be pointed out orr willotherwise appear in the following description of an embodiment of myinvention in which n' Figure l is -i longitudinal sectional view on theline 1-1 of Fig. 2,

Fig. 2 is a cross-section on the line 2 2 of Fig. l, and

Fig. 3 is a cross-section on the line 3 3 'of Fig. l.

The shaft illustrated is composed of longitudinal articulating sectionsof which two only are shown in Fig. 1. Each section consists of an outercylindrical shell 4, provided with rabble arm inlet ports 5 and rabblearm outlet ports 6, the adjacent ports 5, 6

horizontal 'into unequal cross-sectional constituting a-set throughywhich a cooling i' medium is conducted to ble arm 7, and the set or setsof ports in one plane being angularly disposed, as shown-at rightangles, with reference to the set' or sets in a plane longitudinally-spaced from the first mentioned plane. The rabble arms are, of course,provided with and from each rabthe usual channels for the cooling mediumimmediately vabove the first mentioned' hearth.

Secured within the shafts, and dividing it into two longitudinalpassages 8 and 9, is a partition or vane 10 the peripheral edges ofwhich partition extend between the ports 5, 6 of each set and separatesthem so that each port 5 is in communication with said longitudinalpassage 8 and each port 6 is in communication with said passage 9. Thesets of ports are angularly disposed and the partition 8 is curved inthe form of a spiral. The intermediate portion of the spiral partitionis curved away from the straight diametrically extending line of theedge portions thereof so that a bulged or concavo-convex central part 11is formed; thus the partition is made to divide the shaftl portions, theportion 8 .being of less cross-sectional area p than the portion 9.

medium is continuously circulated, the. structural means foraccomplishing this circulation, a. single partition, being of the,simplest kind and possessing many advantages of construction andoperation. The curved form of this partition which can be castintegrally with the shell 4 or be formed separately and then secured tothe. said shell, is

" 'of great practical value because, .among other advantages, it enablesthe constructional elements to withstand the stresses of unequalexpansion without danger of shearing. rlhe bulged part l1 contributes tothis end and in addition serves to provide a larger passage i'or thecooling medium after it has been heated and expanded than before it hasbeen heated, thus desirably insurlng a substantially constant velocityoi the medium in the shaft passages.y

.l claim:

Il. A hollow shaft comprising an outer shell provided with a pluralityof longitudinally spaced and angularly d1sposed sets 0i rabble arm inletand outlet ports, and. a single longitudinal non-diametral partition,dividing the shell into two Chambers, common to all of said sets andextending between and separating their inlet and outlet ports.

2. A hollow shaft comprising an outer shell provided with a plurality oflongitudinally spaced and angularly disposed sets of rabble arm inletand outlet ports, and a longitudinal partition of spiral form extendingbetween and separating the inlet and outlet ports of each set.

3. A hollow shaft comprising' van outer shell provided with sets ofrabble arm inlet and outlet ports, and. a sin le partition lengthwise ofthe shaft dividing the same into unequal cross-sectional portions, saidpartition being common to and extending between and separating the inletand outlet ports of each set.

4. A hollow shaft comprising an outer shell provided with rabble arminlet and outlet ports, and a longitudinal .partition extending betweenand separating said inlet and. outlet'ports, saidpartition being ofspiral form and having a concave-convex central portion.

5. In a hollow roastin furnace shaft provided with peripheral ra ble armapertures, a single substantially longitudinal partition in the shaft,one edge of said partition dividing an arm aperture, andthe partitionitself dividing the shaft into two substantially longitudinal butunequal compart ments.

navegas d. ln a hollow roastii'nif furnace shaft having peripheralapertures adapted to establish connection with hollow rabble arms, asingle longitudinal non.-diametral vane di viding said. shaft into twocompartments for the introduction and igor the discharge or' a coolingmedium, the peripheral edges of said vane forming at the said apertures,partitions dividing said apertures into separate openings. K

7. ln a hollow roasting furnace sb ait having apertures adapted toestablish connection with hollow rabble arms, a single longitudinal vanedividing said shaft into two separate compartments or the introductionand for the discharge of a cooling medium, the rabble arms and theapertures therefor on alternate hearths being all in the same plane andat right angles to the arms and apertures. on the remaining orintermediate hearths, the 'peripheral edges of said vane intersectingall the apertures and forming at the said apertures partitions dividingsaid apertures into separate openings. i

8. A hollow shaft comprising an outer shell provided with a plurality oflongitudinally spaced sets of rabble arm inlet and 4 outlet ports, theports of a given set being angularly disposedin the same horizontalplane, anda single non-diametral longitudi. nal partition'thereindividing the shaft into two separate compartments, an edge of "saidartition being common to and extending etween and separating the. portsof each and all of said sets.

9. A. hollow shaft comprising an outer shell provided with a pluralityof longitudinally spaced and angularly disposed sets of rabble arm inletand outlet ports and a longitudinally twisted partition extendingbetween and separating the inlet and outlet ports or each set. f

ln witness whereof l have hereunto set my hand in the presence of twosubscribing witnesses.

EDWARD J. FO'WLER.

' Witnesses:

E". Bmx, E. lh. Karmann.

